Topic: Some Vitara prep. (Read 9027 times)

DmC · « **Reply #30 on:** April 04, 2009, 12:32:58 PM »

Quote from: onlyflash944 on April 03, 2009, 10:49:40 PM

Quote from: Joseph Davis on April 03, 2009, 03:42:43 PM
You can develop hotspots in a 7.5:1 CR engine?
Quote from: Joseph Davis on April 03, 2009, 07:50:04 PM
Think power levels you can get traction.

i don't see the connection between hotspots on pistons installed in low compression engines and traction

It's called load buddy you can't make boost without it. Yeah ive had slipping clutchs save motors before. And it's only 7.5:1 compression at idle you start adding manily amounts of boost into the combustion chamber and your compressing large amounts of air

Compressed gasses make heat, Heat transfers into whatever it's touching thats coolest the knife edge of a piston has alot of surface area being attacked by high temperatures not to mention the sharp edge in the valve reliefs have a small amount of atoms so it takes less energy less time to heat them up.

ever notice how a soldering iron gets hottest at the tip and melt's solder fast then you touch some solder it the side and it won't even melt it.

Joseph Davis · « **Reply #31 on:** April 04, 2009, 12:45:15 PM »

The theory is all great and applicable, but therein lies the problem. This isn't a single dimensional question, it's an actual applied real world situation.

How much load does wheelspin induce? There's a turbo is300 twenty feet from me that's been run around for two months on stock injectors because wheelspin doesn't load an engine enough to require cooling from a rich mixture.

That Guy · « **Reply #32 on:** April 04, 2009, 12:52:22 PM »

Quote from: Joseph Davis on April 04, 2009, 12:18:19 PM

Cut the side of the valve reliefs out of them, you'll be right as rain.

Thanks man

DmC · « **Reply #33 on:** April 04, 2009, 01:02:34 PM »

Quote from: Joseph Davis on April 04, 2009, 12:45:15 PM

The theory is all great and applicable, but therein lies the problem. This isn't a single dimensional question, it's an actual applied real world situation.

How much load does wheelspin induce? There's a turbo is300 twenty feet from me that's been run around for two months on stock injectors because wheelspin doesn't load an engine enough to require cooling from a rich mixture.

Thats exactly wy my y8 has been fine for almost a year now with the clutch slipping there isn't enough load to really make the motor do any real work. No load no air mass.

TTC · « **Reply #34 on:** April 06, 2009, 07:33:42 PM »

Wouldnt it be safe to say tho that long 4th 5th gear pulls have similar loads on the combustion chamber such as if you put bigt stickies on that IS?

Joseph Davis · « **Reply #35 on:** April 06, 2009, 09:00:05 PM »

Quote from: TTC on April 06, 2009, 07:33:42 PM

Wouldnt it be safe to say tho that long 4th 5th gear pulls have similar loads on the combustion chamber such as if you put bigt stickies on that IS?

Probably not. 2JZ are strange engines, I've been in one that was 14.x:1 AFR at 17 psi and the plugs, piston surfaces, etc, looked great. I don't believe they are any more robust than any other well built engine from any number of automakers but their combustion chambers are very very efficient.

Anyway, what I was getting at is TRACTION. Most of you guys don't have it, and if street tuning the engine is tuned too rich.

DmC · « **Reply #36 on:** April 06, 2009, 09:49:09 PM »

Quote from: Joseph Davis on April 06, 2009, 09:00:05 PM

Quote from: TTC on April 06, 2009, 07:33:42 PM
Wouldnt it be safe to say tho that long 4th 5th gear pulls have similar loads on the combustion chamber such as if you put bigt stickies on that IS?

Anyway, what I was getting at is TRACTION. Most of you guys don't have it, and if street tuning the engine is tuned too rich.

Whachoo talkin bout YOseph? I tune like you mom Lean Mean and always ready to hook up.

widebody93 · « **Reply #37 on:** April 06, 2009, 10:12:22 PM »

this thread is starting to get toooooooo touchy feely.

im fucking bored at work.

Teg2boo · « **Reply #38 on:** April 07, 2009, 09:20:11 AM »

Its snowing as I'm writing these lines WTF?

Nothing to do with the thread, but I'm here so...

Great thread btw ;D

d-man · « **Reply #39 on:** April 07, 2009, 10:21:00 AM »

Lots of snow here too. About a foot last night.

Just had to tell my insurance company that my car isn't modified and will have to write them a letter. :-(

trevor72 · « **Reply #40 on:** April 07, 2009, 01:05:15 PM »

Quote from: Joseph Davis on April 06, 2009, 09:00:05 PM

Anyway, what I was getting at is TRACTION. Most of you guys don't have it, and if street tuning the engine is tuned too rich.

Piston looks good. I didn't see anything about the piston that worried me enough to do this for my build though. As stated I'm sure they'll be covered in a silky layer of carbon in no time anyways; especially if you DD the car.

caged · « **Reply #41 on:** April 08, 2009, 03:17:06 AM »

I did this to my vitara's today. They were sharp as fuck before. cheers for the tip

junkyard racer · « **Reply #42 on:** May 08, 2009, 07:48:43 PM »

was going through endyns article section and found this info
http://www.theoldone.com/articles/engine_tips/enginebuildingtippistons1.html

same thing the OP posted, just more info on the same thing, really.

sloTeg · « **Reply #43 on:** May 09, 2009, 01:14:04 AM »

good idea, im gonna make sure to do that this time around so i dont have a repeat of this:

d-rail · « **Reply #44 on:** May 09, 2009, 03:38:45 AM »

Quote from: sloTeg on May 09, 2009, 01:14:04 AM

good idea, im gonna make sure to do that this time around so i dont have a repeat of this:

That looks brand new. Why'd you take the time and effort to pull out such a masterpiece?

Joseph Davis · « **Reply #45 on:** May 10, 2009, 02:20:47 PM »

Quote from: sloTeg on May 09, 2009, 01:14:04 AM

good idea, im gonna make sure to do that this time around so i dont have a repeat of this:

DO NOT hit a fuel cut revlimit on a turbo D-series. They will melt any piston like this whether stock, Vitara, or forged. That's operator error, sir, and nothing more.

Look into engine management with an ignition cut revlimit, or an MSD Digital box.

Quote from: c0mpl3x on May 09, 2009, 01:45:24 AM

Quote from: Joseph Davis on April 04, 2009, 12:45:15 PM
The theory is all great and applicable, but therein lies the problem. This isn't a single dimensional question, it's an actual applied real world situation.

How much load does wheelspin induce? There's a turbo is300 twenty feet from me that's been run around for two months on stock injectors because wheelspin doesn't load an engine enough to require cooling from a rich mixture.

tell that to 17lbs spinning all 4 from a stop

Yeah, I guess 200 whp in a 3500lb vehicle might turn the tires over a time or two if you raw dogged it. You didn't tune it based off of first gear wheelspin datalogs, so I dont know why you'd bother to interject that crap? D-series, 10 pounds, would turn your stock WRX out.

onlyflash944 · « **Reply #46 on:** May 10, 2009, 07:51:21 PM »

Quote from: Joseph Davis on May 10, 2009, 02:20:47 PM

Look into engine management with an ignition cut revlimit, or an MSD Digital box.

i've been using crome's launch control at the strip, you saying its not a great idea? whats out there for honduhs thats ignition cut?

Conceptz-X · « **Reply #47 on:** May 10, 2009, 07:53:47 PM »

MSD 6AL with a 2 step

Joseph Davis · « **Reply #48 on:** May 10, 2009, 07:55:13 PM »

Quote from: onlyflash944 on May 10, 2009, 07:51:21 PM

Quote from: Joseph Davis on May 10, 2009, 02:20:47 PM

Look into engine management with an ignition cut revlimit, or an MSD Digital box.

i've been using crome's launch control at the strip, you saying its not a great idea? whats out there for honduhs thats ignition cut?

I've not had a problem with the launch control, but I've a couple friends who've melted pistons like that by bouncing off the revlimiter. I think it's the difference between being loaded and being unloaded.

Quote from: Conceptz-X on May 10, 2009, 07:53:47 PM

MSD 6AL with a 2 step

Those are crap. There's a reason why I specifically stated one of the MSD Digital boxes.

Conceptz-X · « **Reply #49 on:** May 10, 2009, 07:57:22 PM »

ok. How about with a soft touch?

My DIS-4 HO took a big 'ol shit on me, so I'm not sold on the reliability of the digital shit Put the old trusty 6A and plug wires on, and all is good again.

onlyflash944 · « **Reply #50 on:** May 10, 2009, 07:58:29 PM »

Quote from: Joseph Davis on May 10, 2009, 07:55:13 PM

Quote from: onlyflash944 on May 10, 2009, 07:51:21 PM
Quote from: Joseph Davis on May 10, 2009, 02:20:47 PM

Look into engine management with an ignition cut revlimit, or an MSD Digital box.

i've been using crome's launch control at the strip, you saying its not a great idea? whats out there for honduhs thats ignition cut?

I've not had a problem with the launch control, but I've a couple friends who've melted pistons like that by bouncing off the revlimiter. I think it's the difference between being loaded and being unloaded.

i never hit the rev limiter in gear on purpose. every once in a while i'll be looking in the mirror at the car catching me and the cel shift light wont' work right and ill hit it for a split second, but nothing extended.

i've been using the launch control for about a month, id say 30 runs and haven't had any problems.

Joseph Davis · « **Reply #51 on:** May 10, 2009, 08:00:32 PM »

Quote from: Conceptz-X on May 10, 2009, 07:57:22 PM

ok. How about with a soft touch?

My DIS-4 HO took a big 'ol shit on me, so I'm not sold on the reliability of the digital shit Put the old trusty 6A and plug wires on, and all is good again.

That's nice. Did you ask after your warranty?

The analog boxes do absolutely nothing when they work correctly, and when they don't they kill power or cause driveability problems.

Conceptz-X · « **Reply #52 on:** May 10, 2009, 08:12:33 PM »

I gotta send the bitch in. but when some shit puts me on the side of the road, or luckily in this case, at the top of the driveway it fucking sucks. especially when the damn thing costs more than $600.

Quote from: Joseph Davis on May 10, 2009, 08:00:32 PM

The analog boxes do absolutely nothing when they work correctly, and when they don't they kill power or cause driveability problems.

EMI?

Joseph Davis · « **Reply #53 on:** May 10, 2009, 08:18:12 PM »

It's not EMI, it slews timing signal badly or completely misfires.

Conceptz-X · « **Reply #54 on:** May 10, 2009, 08:22:07 PM »

ok, Have you seen any reliabality issues with the Digital 6?

jeffsciv23 · « **Reply #55 on:** May 10, 2009, 08:47:42 PM »

i had a digital 6 a few years back, seemed to work great for the 2 step.

Conceptz-X · « **Reply #56 on:** May 10, 2009, 08:52:31 PM »

I liked my DIS-4, till it died. Now, I'm knida uncomfortable going digital with MSD. Have had the 6A since '04 and it's never let me down, as with other MSD analog boxes I've had in the past. But the way JD is talking, I may be needing to retire the 6A when I boost the MR2. Runs well on motor, Just startingto question the added load and possibility of improper timing from the analog box.

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Author Topic: Some Vitara prep. (Read 9027 times)

junkyard racer